Crafted of machined 7075-T6 hard anodized aluminum, with titanium crossbolts and jaws, they give you the performance of steel at half the weight. This unique construction provides strength well beyond that normally found in lightweight rings. If you think you need 50% more clamping force, the six-screw Ultralite rings will hold your riflescope under any conceivable situation. The Ultralite rings are offered in six heights for 30mm tubes and four heights to fit 34mm tubes.